What structures do the superior articular facets of the Atlas/C1 articulate with?

• A. Occipital condyles
• B. Thoracic vertebrae
• C. C3 and C4 vertebrae
• D. Transverse processes of C2

Answer: (A)

The correct answer is that the superior articular facets of the Atlas (C1) articulate with the occipital condyles of the skull. This articulation forms the atlanto-occipital joint, which is crucial for the nodding motion of the head, allowing for flexion and extension. This joint enables movements such as tilting the head forward and backward.

The other structures listed do not articulate with the superior articular facets of the Atlas. The thoracic vertebrae, C3, C4 vertebrae, and transverse processes of C2 are not involved in the direct articulation with C1. Instead, C1 primarily engages in a unique relationship with the skull, demonstrating its specialized role in supporting the cranium and facilitating a significant range of head movement.